Electrical Motor mechanical worm gear screw jack with self lock trapezoidal lifting screw is widely used for raising and lowering Louver Damper. In modernization hydropower station or hydro-projects, which uses electrical motor driven instead of human power starting with a simple manual operation screw jack. Motorized Single unit, Dual units...multiple units or tandem mechanical worm gear screw jacks arrangements with kinds of motors for Louver Dampers.